Engine-chasing machine



Dec. 22, 1925- L.J.MO$T

ENGINE CHAS ING MACHINE INVENTOR :37 BY gull- M056 U'A QRNEY 5 Sheets-Sheet 1 Filed May 5, 1924 Dec. 22, 1925- 1,566,910

| J. MOST ENGINE CHAS ING MACHINE 4 ATTORNEY Dec. 22, 1925- 1,566,910

L. J. MOST ENGINE CHASING MACHINE Filed May 5, 1924 3 Sheets-Sheet llllllllllllll c IL/9-11, 5% '15 7 10+ L ;s w

g 1 015; fi gflfl INVENTOR BY ZL lzTi/flwfi,

ATTORNEY Patented Dec. 22, 1925.

UNITED STATES LUCIFER J". MOST, OF NEW YORK, N. Y.

ENGINE-CHASING MACHINE.

Application filed May 3,

To all whom it may concern:

Be it known that I, LUGIFER J. Mom, a citizen of the United States, and a resident of the countyof the Bronx, city and State of New York, have invented a new Engine- Chasing Machine, of which the following is a full, clear, and exact description.

My invention relates to a semi-automatic machine for engine chasing that is an improvement over my Patent #1,395,861, issued on November 1, 1921.

The new features of the machine are the means whereby the chasing of continuous lines or interrupted lines may be obtained, or the combination of the two, the yielding mounting of each chasing tool and the independent adjustment of the same whereby a plurality of cylindrical members may be chased which may slightly vary in diameter from one another, the movement of the chasing tools to and from the work and laterally of same, and the design controlling means for operating the chasing tools to obtain the desired motions of the same, the manual angular displacement of the work independent of the automatic permitting a larger spacing between the chased lines without the necessity of stopping the machine. The other features of the machine will appear as the description proceeds.

In the accompanying drawings, forming a part of this application, b

Figure 1 is a plan view of my machine set to operate with the master mandrel which controls the lateral movement of the chasing tools; the spacer bar being removed to better show the details oft-he carriage,

Figure 2 is a rear elevation of the head stock showing the gear arrangement for rotating the drive-centers,

Figure 3 is a section on line 3-3, Figure 1, illustrating how the master mandrel which controls the lateral movement of the chasing tools, is moved longitudinally and angularly,

Figure 4 is a front elevation of the machine, a part of which is shown in section to illustrate the manner in which the chasing tools are mounted,

Figure 5 is a section on line 5-5, Figure 1, illustrating the means for maintaining the chasing tools in operative or in inoperative position,

Figure 6 is a section on line 66, Figure 1, illustrating the way the spacer bar is mounted,

Figure section on line 7.7-7, Figure 1924. Serial No. 710,862.

1, showing the details of the clutch mechanism, the crank and the cross-head.

Figure 8 shows the collar used where name spaces are to be provided on the chased members,

Figure 9 illustrates the different lines that may be chased by means of the master-mandrel which actuates the chasing tools laterally,

Figure 10 is a section similar to Figure 6 but illustrating the master mandrel which is placed in lieu of the spacer bar for actuating the chasing tools to and from the work,

Figure 11 is a section on line. 11 11, Figure 10,

Figure 12 is a Figure 10,

Figure 13 is a Figure 10,

Figure 14 is a fractional elevation of the master-mandrel, with one insert therein,

Figure 15 is an elevation of a spacer ring that may be fitted on the mandrel to provide clear spaces on the chased work,

Figure 16 shows an elevation of a segment that may be fitted on to the mandrel to provide name spaces,

Figure 17 illustrates the lines obtained by the insert illustrated therewith, and

Figure 18 shows the type of lines produced by the insert illustrated therewith.

Referring to the drawings, 10 is the bed of the machine, having suitable legs 11; mounted to slide on the bed is a carriage 12 connected to a slotted cross-head 13 by the extension 1 1 of the cross-head. The said extension fits into a groov 15 provided in thecarriage. (See Figure 6.) A screw 16 mounted to revolve in the groove 15 of the section on line 12-12,

section on line 1313,

. carriage but prevented from longitudinal displacement thereof, is engaging the nut 17 retained in the extension let of the crosshead. The said nut has a threaded extension 18 which projects through a slot 19 in the carriage and a nut 20 on the threaded extension 18 permits the locking of the carriage to the extension 1 1 of the cross-head. The screw 16 and the nut 17 permits a relative longitudinal adjustment between the cross-head and the arriage, whereby the carriage can be reciprocated anywhere on the bed.

The length of th stroke of the carriage 12 on the bed 10 may be varied by the adjustmentof the crank pin 21 in the crank 22, by screw 23 threaded through the crank pin and retained in the crank 22. (See Figure 7.) By bringing the stone 24, whlch is mounted on the crank pin, nearer to the axis of the drive-shaft the stroke of the carriage 12 on the bed is reduced. pulley 26 is mounted to revolve freely on the driveshaft 25. The pulley has, a clutch face 27 adapted to be engaged by one face of a double-facedclutch member 28 mounted to slide on the drive-shaft '25 but constrained to revolve therewith. A fork 29 for actuatingthe double-clutch member 28 is pivotally mounted on the extension 30 of a leg 11 of the bed. Thefork is normally maintaining. the other face of the clutch member28 in engagement with a clutch member 31 through the medium of a spring 32'act1ng against a lug 34: of the fork 29, so that normally the spring 32 tends to disengage the power from the drive-shaft 25.

The clutch-member 31 has an extension 35 to which a handle 36 is secured and where through a rotary motion can be imparted to the drivershaft 25 while the pulley 26 is free to revolve. This is for the manual setting of the machine. A yoke 37 is made to engage the foil: 29 to move it on its pivot, The yoke is in turn pivotally supported on a bracket 38 secured to the. upright 39. which forms the bearing for the main drive-shaft 25'. The yoke 37 has a bell-crank lever extension 39 which is connected by rod 40 to an operating handle 41. (See Figures 1 and 1.) The handle has a rider 42 which lays against a plunger 43, the spr ng ll of which normally forces the plunger beyond the rider. v v

In consequence, when the operating handle 41 is moved to the dotted position shown in Figure 2, the rider forces the plunger in until the rider passes the plunger when the plunger will lock the handle ll and the clutch member 28 will be disengaged from the clutch member 31 and the clutch member 27 will b engaged by the clutch member 28. Thus, the drive-shaft 25will be driven from the pulley 26. The spring 32 is unable to disengage the clutch member 26 as the handle 41 is locked in the operative position by means of theplunger 4:3 and will remain in locked position until it is put in the inoperative position as shown in full lines in Figure 1.

The carriage 12 is-provided with a headstock 45 which carries the driving-centers 16. Each of the driving centers is coupled to a respective gear 47, motions to which are imparted by suitable idler-gears 48 from the central drivegear 49, which is in turn coupled to a ratchet 50. (See Figures 1, 2 and 6.)

As will be seen from Figure 2, all of the centers revolve in the same direction by the arrangement of the gears, as shown. Motion is imparted to the ratchet 50 by a pawl v 51 (see Figures 1 and 2), which pawl is actuated by a bell-cranked lever 52', through the medium of a rod 53 mounted adjustably in the bracket 54: which bracket is secured to the bed 10. As the carriage 12 is moved to the rear through the motion of the crank 22, the rod 53 will engage the bell-cranked lever 52 as the carriag 12 reaches the end of its stroke, thereby causing the pawl 51 to move the ratchet 50. The angular motion of the ratchet 50 depends on the angular displacement of the bell-cranked lever 52, the amount of which in turn isdependent on the rod 53. In other words, the longer the engagement of the rod 53 with the bell-crank lever 52, th greater is the angular displacement of the ratchet and therefore of the driving-centers. The bell-cranked lever 52 and the pawl 51 are restored to their normal position by a spring 55, and it will be noted that the ratchet operating mechanism, consisting of the pawl, the bell-cranked lever and the spring, are all mounted on the carriage 12.

It is often desirable to operate the drivecenters 46 manually from the front of the machine and independently of the rod For this purpose, I provide an arm 56 which 18 mounted on a rod 57, extendingto the front of the carriage 12 and thereat provid'ed with a handle 58 (see Figures 1, 2 and 4-). Suitable bearings are provided for the rod 57 so that the arm can be rocked through the medium of the handle 58. The angular displacement of the arm 56 may be adjusted by av screw 59 mounted to limit the movement of the handle 58. The spring 55 'restores'th'e arm and therefore the handle 58 t o normal position, as will be seen from the drawings.

p The carriage 12 also carries a tail-stock 60 which is provided with a series of supporting centers 61 aligning with the drivecenters 46 of the head-stock. The tail-stock is adjustable longitudinally on the carriage 12 so that different lengths may be placed'betwcen the centers of the tail-stock and the head-stock. In addition, each of the centers 61 is adjustable in the tail-stock to compensate for the slight variation in lengths that is to be accommodated between the centers. The drawings show the machine equipped for four centers but the number may be increased, if so desired,

without in any way changing the main features of the machine. 7

The carriage 12 carries brackets 62 in which bear the trunnions of the mastermandrel, 63. The master-mandrel has a number of inserts 65 each having different depressions or raised portions, as the case may be, running transversely of the axis of the mandrel. (See Figures 1 and 3.) A smooth insert, that is one without any depressions or raised portions, s also provided for producing straight lines 011 the work to be chased. lxeyed to the front trunnion of the master-mandrel is a disc 66 having as many notches 67 as there are inserts in the master-mandrel. A suitable spring-actuated plunger 68 is provided on the front bracket for engaging the notches and whercby the desired insert can be brought opposite the tracer 69 which is secured to the slide 70 ot' the super-structure 64; on the bed 10.

The housing 71 of the spring plunger has a retaining lip 72 which prevents a longitudinal displacement of the disc 66. The disc 66 has an integral-grooved collar 73,the grove of which is engaged by the lugs T4 of a nut '75 threaded on to the trunnions of the master-niandrel. By rotating the nut T5 a longitudinal displacement'may be imparted to the master-mandrel without rotating the same. The nut 7 has notches 75 for regis tering with a spring 75" for indicating a definite longitudinal displacement of the master mandrel.

The slide 70 houses as many plungers 76 as there are centers in the head and tail stocks and the said plungers lay in substantially vertical planes passing through the axes of the centers. Each p unger is provided with a spring 77 (see Figure l) the tension of which inlay be varied by a nut The tendency of the spring 77 is to normally press the plunger downward and in conscqucnce maintain a yielding pressure of the chasing tool 79 which is carried by the plunger upon the work which is carried bc tween the centers. All the plungers pass freely through a plate 80 and against which they are retained by the springs 77' of the plungers through the medium of the corresponding nuts 81 provided on the plungers. The nuts 551 permit the adjustment of each plunger to accommodate different sizes of work to be performed by the machine.

Er stem 82 is threaded into the plate S to extend freely through the slide 70, past the super-structure 64, so that the lower extremity S3 of the stem 82 will come in contact with adjustable collars 84 provided on a spacer bar 85 mounted on the carriage 1; (See Figure 6.) The spacer bar is mounted parallel with the work disposed in the centers; the collars engaging the end 83 of the stem when the carriage is on its operative stroke, thereby raising the chasing tools from the work and leaving unchased spaces corres iionding to the size of the collars. This arrangement permits me to chase a nun'iber of various lengths of tubes used for fountain pens and pencils. In places where I eesire to provide a name space I use collars with a cut-away portion, as shown in Figure 8. By turning the bar 85 to bring the round portion of the. collar under the end S3 of the stem .82. the .cliasiuis are relierrd from the the end 83 he collar does not come into operative engagement with said end 83 and permits the chasing tools to chase the work.

To disengage the chasing tools from the work during the inoperative stroke of the carriage, which is the rearward stroke. I provide a plate 86, hinged with one end to the super-structure, the other end being engaged by an arm 87, mounted to rock on the super-structure so that the plate 86 can be moved to and from the plate 80. The motion of the plate 86 is transmitted to the plate 80 by two screws 88 secured in the plate 80 and l airing upon the plate 80. (rice liigures 1 and 4;.) The screws 88 per mit the adjustment necessary for the various positions of the plate 80 that it may occupy according to the size of the work being chased.

The arm 8? is coupled to an arm 89, which arm 89 is engaged by a spring-actuated rod 90 (se Figures 1' and the tendency of which spring-actuated rod 90 is to move the arm to the dotted position shown in Figure 1. thereby permitting the chasing tool to bear upon the work in the centers.

The carriage 12 carries at the front end a rod 9t (sec l igures l and 1;) adjustable in the brawzet 91. This rod 91 is adapted to strike the spring-actuated rod 90 when the carriage is approaching the end of its for' ward stroke. thereby bringing the arm 87 into the position shown in full lines in Figure 5. the total spring pressure of the plungers To being greater than the pressure ot the spring on the rod 90 the same cannot more the arm 8? to the dotted position shown in liigm'e utter it has been. placed in the upright position shown in Full lines in said Figure :3. ln consctplence. the carriage will return to its rcarwm'd position without the chasing tools being able to touch the work in the renters. As the car riage :u'iproaches the end of its rearward stroke the springact uated rod 94) is engaged by the rod 93 maintained :uljustnbly on the 'arriage in the same manner as the rod 5)]. This engagement oi" the rod 9? with the rod 90 displates the arm 87 to the position shown in dotted lines in Figure in which position it is maintained by the springactuated rod )0 during the operating torward stroke of the machine while the tools are raised trom the work by the collars 84-.

The engagement of the tracer G9 with the insert in the nmster-1zmndrcl is maintained by a spring 92 which is arranged to continuously move the slide towards the mastermandrel. This lateral movement of the slide in the super-structure (it carries therewith the chasing tools. the lateral movement of the slide being controlled by the inserts of the umeter-mandrel. ll the insert presents a smooth surface there would be no lid) ' pressions or raised portions of the insert the greater will be the number and depth of the work during the inoperative stroke.

lateral displacements of the chasing tools during the operating stroke of the carriage.

To relieve the tracer from the inserts of the master-mandrel during the time when the chasing tools are off the work, I provide the stem 83 with a nut 94 which has a tapered portion 95 adapted to engage a member 96 fixed to the super-structure. It will be seen that when the plate 80 is raised by the plate 86 it will cause the nut 95 to engage the member 96 and thereby carry the slide and therewith the tracer 68, away from the master-mandrel. The same will be true when a collar engages the end 8301? the stem 82, so that whenever the chasing tools are raised from the work the tracer is automatically disengaged from the master mandrel.

hen the work is placed between the centers of the head and tail stocks the pressur of the chasing tools upon the work is then adjusted by forcing first the arm 87 into the dotted position shown in Figure 5. This permits the plate to drop clearing the nuts 81 of the plungers 76 from said plate 80, whereby each plunger will have an inde pendent yielding pressure upon the work. The tension of the spring can then be adjusted by means of the nut 78. The amount of clearance between the plate 80 and the nuts 81 depends upon how much clearance is desired between the chasing tools and the y threading the stem 82 in or out, in the plate 80 the necessary amount of clearance is ob tained for the chasing tools when the collars 84 pass under the end 83 ot' the stem. The nut 91 can then be adjusted so as to "force the tracer 69 out of its engagement with the master-mandrel when the stem 82 is raised either by a collar or the arm 87.

It the entire length of work is to be chased the crank pin 21 will be substantially in the position shown in Figure 7. On the other hand, it it is desired to chase only the middle portion of the work, the crank pin is moved the desired distance towards the axis of the drive-shaft 25, to obtain the length desired. It, on the other hand, work is be chased near the tail-stock the screw 16 is threaded into the nut 17 thereby moving the carriage 12 nearer to the cross-head, whereupon only that part of the work will be chased. The reverse is true if the screw 16 is turned so as to move the carriage 12 away from the crosshead 18 the part ofthe work nearer the headstock will be chased. This arrangement permits me to chase the work at any desired part thereof and through any desired length not exceeding the full stroke.

By providing a series of inserts on the master-mandrel the operator can present to the tracer of the slide at any time any one of the inserts on the mandrel by turning the disc 66; the changing of the engagement of the inserts with the tracer is made during the inoperative stroke of the carriage, thereby on the same tube 1 can produce different shapes of lines, convex, concave, angular or curvilinear (see Figure 9, lines a, b, c, d) as the slide will automatically follow the configuration of the inserts the tracer 69 engages. Furthermore, the same insert can be moved longitudinally with relation to the tracer and therefore a series of similar configurations can be produced in the staggered relation on the work (see lines a, a, and

(Z, cl). The work is turned automatically at the end or" a complete stroke, that is, operative and inoperative.

Where designs are to be formed of broken lines, shown in Figures 17 and 18, some of the inserts 65 may be removed from the master-mandrel 63, to be placed into a master-mandrel 97. (See Figures 10-12.) The master-mandrel 97 is mounted to slide on a central arbor 98, which takes the place of the spacer bar 85. The arbor is provided with a key 99 which fits into a keyWay 100 provided in the extension of the masterniandrel 97. In consequence. the angular movement imparted to the arbor 98 is transmitted to the master-mandrel 97. As shown, the master-mandrel 97 is provided with four inserts and in consequence the arbor has four notches 101, which may be engaged by a locking mechanism 102 carried by the front bearing of the arbor. (See Figure 13.) By this means any of the inserts may be presented to the stem 82.

The longitudinal displacement of the master-mandrel 97 on the arbor is controlled by a nut 103, which is threaded on to the extension. of the master-mandrel. The nut is prevented trom longitudinal displacement by a bracket 104 secured to the front bearing and the amount of angular displacement of the mandrel is indicated by the engagement of a spring 105 carried by the front bearing and adapted to engage the notches 106 provided in the nut. This arrangement permits a definite staggered relation of the broken chased lines.

When it is desirable to chase sections shorter than the complete stroke of the machine, suitable collars 107 (see Figure 15), may be mounted upon the master-mandrel. The collar may be retained at predetermined places as threaded holes 108 are provided on the master-mandrel as shown in Figure 14-. The same holes are used with segments 109 which may be secured as indicated in dash and dot lines in Figure 1-1 where the work during operative and inop rative name space is to be provided.

hen the master-mandrel shown in Figure 10 is used with an insert as shown in Figure 17, broken lines, as shown in said figure, will be chased, and, if an insert 65, as shown in Figure 18 is brought under the stem 82 broken lines, as shown in said Fig ure 18, will be chased upon the work. The master-mandrel 63 is in inoperative connection with the tracer when the mastermandrel 97 is used. This can be obtained by removing the tracer or bringing the groove of the master-mandrel 63, from which an insert has been removed, opposite the tracer.

The provision for the manual angular displacement of the work permits me to provide clear spaces along the part chased which are Wider than those normally permitted by the means for automatically turning the work, without stopping the operation of the machine.

From the above description it will be seen that with my machine I can provide designs of very great variety and different types either of continuous or intermittent lines, or of the two.

I claim:

1. In an engine chasing machine. wort supporting means mounted to reciprocate, a chasing tool mounted to bear upon the work. a master-mandrel for actuating the chasing tool, automatic means for displacing the work angularly, and adjustable manual means for displacing the work through a predetermined angle independent of the automatic means.

2. In an engine chasing machine, work supporting means mounted to reciprocate, a chasing tool mounted to move to and from the work and to move laterally of the work supporting means, a master-mandrel for moving the chasing tool laterally, means for moving the chasing tool to and from the work, means for displacing the work angularly, and means for disconnecting the chasing tool from the mandrel when the chasing tool is raised from the work during the operative and inoperative stroke.

3. In an engine chasing machine, work supporting means mounted to reciprocate a slide mounted to move laterally of the work supporting means, a chasing tool in the slide mounted to move to and from the work. yielding means for moving the chasing tool toward the work, means for moving the chasing tool from the work, a master-mandrel, a tracer in the slide for engaging the master-mandrel, yielding means for maintaining the engagement of the tracer with the master-mandrel, and means for moving the slide against the yielding means to disconnect the tracer from the master-mandrel when the chasing tool is raised from the stroke.

In an engine chasing machine. work supporting means mounted to reciprocate, a chasing tool mounted to move to and from the work and laterally of the work supporting means. a n'iaster-mandrel carried by the work supporting meaiis and mounted to more angnlarly and longitudinally relative to the work. yielding means for maintaining the engagement oi. the chasing tool with the master-mandrel, means for displacing the work angularly, yielding means for maintaining the engagement of the chasing tool with the work, and means for relieving the chasing toolv from the work.

In an engine chasing machine, work supporting means mounted to reciprocate, a chasing tool mounted to move to and from the work and laterally of the work supporting means, a master-mandrel carried by the work supporting means and mounted to move angularly and longitudinally relative to the work, yielding means for maintaining the engagement of the chasing tool with the master-mandrel, means :t'or displacing the work angularly, yielding means for maintaining the engagement of the chasing tool with the work. means for relieving the chas ing tool from the York at predetermined intervals, and means for disconnecting the chasing tool from the master-mam]rel when the chasing tool is relieved from the work by said tool relieving means.

6. In an engine chasing machine, a bed, a carriage thereon, mounted to reciprocate. a head and tail-stock on the carriage, a plu- 'ality of co-operative centers in the head and tail-stock where-between work may be accommodated, means for in'iparting an angular movement to the centers o't'the headstock, adjustable means carried by the bed for actuating the means for the angular displacement ot the centers, manual means as sociated with the carriage for operating the means for the angnladisplacement of the centers independent ot the zuljustable means on the bed, a sliper-structnre associated with the bed, a slide in the super-structure disposed to move laterally ot' the carriage, chasing tools in the slide, each disposed in cooperative relation to a pair of centers oi the head and tail-steel yielding means tor each of said chasing tools to more said tools into engagement with the work in the centers. a

)late enga ing all of said chasing tools t. 2 m n 7 "means on the super-structure for engaging the plate whereby the chaslng tools could be moved to and from the carriage, means on the carriage for engaging means on the su per-structure at the end of each stroke, a master-mandrel carried by the carriage, a tracer carried by the-slide. yielding means for moving the slide toward the engagement of the master-mandrel, an adjustable stem carried by the carriage for engaging the stem whereby the plate may be actuated independently of the means carried by the super-structure, and means interposed between the stem and the super-structure for moving the slide away from the mastermandrel when the plate is raised by the stem.

7. In an engine chasing machine, a bed, a carr age thereon mounted to reciprocate, a head and tail-stock on the carriage, a plurality of co-operative centers in the head and tail-stock where-between work may be accommodated, motion transmitting means for imparting an angular movement to the centers of the head-stock, a super-structure associated with the bed, a slide in the superstructure disposed to move laterally of the carriage, chasing tools in the slide, each disposed in an operative relation to a corresponding pair of centers of the head and tail-stock, yielding means for each of said chasing tools to maintain the same upon the work, a plate for raising all of said chasers simultaneously, means for actuating the plate at the end of each stroke to raise or lower the chasing tools, means for actuating the plate during the stroke when the chasing tools are in engagement with the work between the centers, a master-mandrel carried by the carriage, a tracer carried by the slide engaging the master-mandrel, and

means for moving the slide away from the master-mandrel when the chasing tools are "raised from the work.

8. In an engine chasing machine, a bed, work supporting meansimounted to recipro cate on the bed, a super-structure on the bed, a slide in the super-structure mounted to move laterally of the work supporting means, a master-mandrel carried by the work sn 3 nor-tin means a tracer carried b the slide for engaging the master-mandrel,

. a plurality of plungers in the slide, yielding means for moving the plungers towards the work supporting means, a plate engaging the plungers, a plate hinged to the super-structure, a rocker arm on the superstructure for moving the hinged plate to and from the plate connected to the plungers, means in the plate of the plungers for engaging the hinged plate, means carried by the work supporting means for engaging the rocker arm at the end of each stroke of the work supporting means, yielding means for moving the slide to ards the master-mandrel, means carried by the plate of the plungers extending towards the worksupporting .means, means carried by the work supporting means for engaging the stem whereby the plate of the plungers may be actuated independently of the rocker arm, and means interposed between the stem master-maudrel, adjustable and the super-structure for moving the slide from the master-mandrel when the plungers are raised.

9. In an engine chasing machine, a bed, a carriage mounted to reciprocate on the bed, means on the carriage for accommodating work to be chased, motion 7 transmitting means for imparting an angular movemen' to the work, adjustable means carried by thebed for actuating the motion transmitting means, means for manually operating the motion transmitting means independently oi the adjustable means on the bed, a supelf-structure on the bed, a slide in the super-structure mounted to move laterally ot the carriage, a plurality of plungers in the slide mounted to move to and from the work on the carriage, yielding means for each plunger to move it towards the work on the carriage, a plate engaging all the plungers, a rocker arm on the super-structure, a member engaging the rocker arm and the plate, adjustable means on the earriage for actuating the rocker arm at the end of each stroke whereby the plungers are maintained in the raised or in the lowered position during the stroke, a stem secured adjustably in theplate entending from the super-structure to the carriage, a spacer bar on the ca-rniage for engaging the stem to raise the plungers from the WOIi, a masterunandrel on the carniage, a tracer on the slide for engaging the master-mandrel, a yielding member for moving the slice to bring the tracer into engagement with the means on the stem, and means on the super-structure adapted to be engaged by the adjustable means on the stem to move the slide away from the master-mandrel.

10. In an engine chasing machine, work supporting means mounted to reciprocate. a.

chasing tool mounted :to move to and from the work supporting means and laterally of the work supporting means, a masternnandrel for engaging the chasing tool .to move the same laterally, means for maintaining 11. In an engine chasing machine, work supporting means mounted to reciprocate, a chasmgtool mounted to move to and from the work and move laterally of the work supporting .means, a master-mandrel for moving the chasing tool .la-tera. ly, a mastermandrel for moving the chasing tools to and from the work, means for displacing each of the master-mandre'ls angularly and longitudinally, and means for displacing the work an ularly.

LUCIFER J. MOST. 

